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// This file is part of Substrate.

// Copyright (C) 2018-2022 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

use crate::{
	error,
	params::{GenericNumber, PruningParams, SharedParams},
	CliConfiguration,
};
use clap::Parser;
use sc_client_api::{Backend, UsageProvider};
use sc_service::chain_ops::revert_chain;
use sp_runtime::traits::{Block as BlockT, Header as HeaderT, NumberFor};
use std::{fmt::Debug, str::FromStr, sync::Arc};

/// The `revert` command used revert the chain to a previous state.
#[derive(Debug, Parser)]
pub struct RevertCmd {
	/// Number of blocks to revert.
	#[clap(default_value = "256")]
	pub num: GenericNumber,

	#[allow(missing_docs)]
	#[clap(flatten)]
	pub shared_params: SharedParams,

	#[allow(missing_docs)]
	#[clap(flatten)]
	pub pruning_params: PruningParams,
}

/// Revert handler for auxiliary data (e.g. consensus).
type AuxRevertHandler<C, BA, B> =
	Box<dyn FnOnce(Arc<C>, Arc<BA>, NumberFor<B>) -> error::Result<()>>;

impl RevertCmd {
	/// Run the revert command
	pub async fn run<B, BA, C>(
		&self,
		client: Arc<C>,
		backend: Arc<BA>,
		aux_revert: Option<AuxRevertHandler<C, BA, B>>,
	) -> error::Result<()>
	where
		B: BlockT,
		BA: Backend<B>,
		C: UsageProvider<B>,
		<<<B as BlockT>::Header as HeaderT>::Number as FromStr>::Err: Debug,
	{
		let blocks = self.num.parse()?;
		if let Some(aux_revert) = aux_revert {
			aux_revert(client.clone(), backend.clone(), blocks)?;
		}
		revert_chain(client, backend, blocks)?;

		Ok(())
	}
}

impl CliConfiguration for RevertCmd {
	fn shared_params(&self) -> &SharedParams {
		&self.shared_params
	}

	fn pruning_params(&self) -> Option<&PruningParams> {
		Some(&self.pruning_params)
	}
}